package com.hu.reggie.filter;

/*
    检查用户是否登录
 */

import com.alibaba.fastjson.JSON;
import com.hu.reggie.common.BaseContext;
import com.hu.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import sun.rmi.runtime.Log;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.concurrent.BlockingDeque;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    // 路径匹配器，支持通配符
    private static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;
        log.info("拦截请求：{}",request.getRequestURI());
        //1、获取本次请求的URI
        String url=request.getRequestURI();
        //定义不需要处理的请求路径，登录、登出、静态资源
        String [] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",    // 移动端发送短信
                "/user/login"       // 用户登录
        };

        //2、判断本次请求是否需要处理
        boolean check = check(url, urls);
        //3、如果不需要处理，则直接放行
        if (check){
            log.info("本次请求{}不需要处理",url);
            filterChain.doFilter(request,response);
            return;
        }
        //4、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id：{}",request.getSession().getAttribute("employee"));

            // 获取当前用户id，并封装到TreadLocal中
            Long empId= (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //4-2、判断移动端用户登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id：{}",request.getSession().getAttribute("user"));

            // 获取当前用户id，并封装到TreadLocal中
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /*
        路径匹配
     */
    public boolean check(String requestUrl,String []urls){
        for (String url:urls){
            boolean match = PATH_MATCHER.match(url, requestUrl);
            if (match){
                return true;
            }
        }
        return false;
    }
}
